Wow! I still have my helmet from when I started riding and got my own :) I wouldn't use it though. I also don't recommend headbutting the ground! :P He looks like a great horse and you look like you are having a lot of fun.
I wish I could find a picture of me and Smokey. He was the first horse I ever rode by myself/ not on a trail ride. I love him so much but he was such a cranky sour pony. In the picture I look petrified and miserable I replaced that face now with my serious face haha.